C Program User-defined Function to Search For 1st Occurrence of Char in String

The strchr function finds the first occurrence of a specified character in a string, If the specified character is found, the function returns a pointer to that character; otherwise, it returns a NULL pointer. Initially, the strchr function is used to locate the position of the first ‘ l ‘ character in strings and its address is assigned to pointer result.

#include <stdio.h>
char *strchr(char *string, char letter);
int main()
{
            int i;
            char strings[2][30]={"hello world","C programming"};
            char letters[]={'l','z'},*result;
            clrscr();
            for (i=0;i<2;i++)
                {    
                     if(*(result=strchr(strings[i],letters[i]))!=NULL)
                       printf("\n\n\"%s\" was scanned for \'%c\'.\nFunction returned:->  %s",strings[i],letters[i],result);
              else
                       printf("\n\n\'%c\' was not found in \"%s\"",letters[i],strings[i]);
                }  
                       getch();
                       return 0;
}
                       char *strchr(char *string, char letter)
                   {
                       char *ptr=NULL;
                       while (*string!=letter && *string!=NULL)
                                ptr=++string;
                                return (ptr);
                   }