solves check if work occurs as prefix of any word in sentence

Author: anishLearnsToCode

Diff for: README.md

@@ -369,7 +369,7 @@
 | 1441 | [Build An Array With Stack Operation](https://leetcode.com/problems/build-an-array-with-stack-operations)                                            |                                                         [![Java](assets/java.png)](src/BuildAnArrayWithStackOperations.java)                                                         |                                                                                                                                   |
 | 1446 | [Consecutive Characters](https://leetcode.com/problems/consecutive-characters)                                                                       |                                                              [![Java](assets/java.png)](src/ConsecutiveCharacters.java)                                                              |                                                                                                                                   |
 | 1450 | [Number of Students Doing Homework at Given Time](https://leetcode.com/problems/number-of-students-doing-homework-at-a-given-time)                   |                                                    [![Java](assets/java.png)](src/NumberOfStudentsDoingHomeworkAtGivenTime.java)                                                     |                                                                                                                                   |
-| 1455 | [Check If Word Occurs as Prefix of any Word in Sentence](https://leetcode.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence) |                                                                                                                                                                                      |                                                                                                                                   |
+| 1455 | [Check If Word Occurs as Prefix of any Word in Sentence](https://leetcode.com/problems/check-if-a-word-occurs-as-a-prefix-of-any-word-in-a-sentence) |                                                 [![Java](assets/java.png)](src/CheckIfAWordOccursAsAPrefixOfAnyWordInASentence.java)                                                 |                                                                                                                                   |
 | 1460 | [Make 2 Arrays Equal by Reversing Sub Arrays](https://leetcode.com/problems/make-two-arrays-equal-by-reversing-sub-arrays)                           |                                                                                                                                                                                      |                                                                                                                                   |
 | 1464 | [Maximum Product of 2 Elements in Array](https://leetcode.com/problems/maximum-product-of-two-elements-in-an-array)                                  |                                                                                                                                                                                      |                                                                                                                                   |
 | 1469 | [Find All Lonely Nodes](https://leetcode.com/problems/find-all-the-lonely-nodes)                                                                     |                                                                                                                                                                                      |                                                                                                                                   |

Diff for: src/CheckIfAWordOccursAsAPrefixOfAnyWordInASentence.java

@@ -0,0 +1,21 @@
+public class CheckIfAWordOccursAsAPrefixOfAnyWordInASentence {
+    public int isPrefixOfWord(String sentence, String searchWord) {
+        int matchIndex = -1;
+        do {
+            matchIndex = sentence.indexOf(searchWord, matchIndex + 1);
+            if (matchIndex == -1) return -1;
+            if (matchIndex == 0 || sentence.charAt(matchIndex - 1) == ' ') {
+                return spacesUpto(sentence, matchIndex) + 1;
+            }
+        } while (matchIndex < sentence.length());
+        return -1;
+    }
+
+    private static int spacesUpto(String string, int endIndex) {
+        int spaces = 0;
+        for (int index = 0 ; index < endIndex ; index++) {
+            if (string.charAt(index) == ' ') spaces++;
+        }
+        return spaces;
+    }
+}