Merge pull request #2262 from seinlin/28

Add 0028-find-the-index-of-the-first-occurrence-in-a-string.c

Author: MHamiid

c/0028-find-the-index-of-the-first-occurrence-in-a-string.c

@@ -0,0 +1,19 @@
+int strStr(char * haystack, char * needle){
+    int h_size = strlen(haystack);
+    int n_size = strlen(needle);
+    int i, j;
+    if (h_size < n_size) {
+        return -1;
+    }
+    for (i = 0; i < h_size - n_size + 1; i++) {
+        for (j = 0; j < n_size; j++) {
+            if (haystack[i + j] != needle[j]) {
+                break;
+            }
+        }
+        if (j == n_size) {
+            return i;
+        }
+    }
+    return -1;
+}