char *my_select_char(char *string, char c);

char *my_select_char(char *string, char c) {
  // Create a pointer to the selected character.
  char *selected_char = NULL;

  // Copy the string to a new buffer.
  char new_string[strlen(string) + 1];
  my_strcpy(new_string, string);

  // Find the first occurrence of the given character in the new string.
  selected_char = my_strchr(new_string, c);

  // If the character is found, return a pointer to it.
  // Otherwise, return NULL.
  return selected_char;
}

#include <stdio.h>
#include <string.h>

char *my_strcpy(char *dest, char *src);
char *my_strchr(char *string, char c);
char *my_select_char(char *string, char c);

int main() {
  char string[] = "This is a test string.";
  char c = 's';

  // Select the given character in the string.
  char *selected_char = my_select_char(string, c);

  // If the character is found, print it.
  if (selected_char != NULL) {
    printf("The selected character is: %c\n", *selected_char);
  } else {
    printf("The given character was not found in the string.\n");
  }

  return 0;
}

The selected character is: s

Further Reading:

Implementation of strncat() in C

add source string at the end of destination string

comparing two string using strcmp and strncmp

Design a function to copy to copy string into destination string using strcpy and strncpy

how to implement implementation of strncpy in c

Design a function to calculate the length of the string using strlen

pre defined string based function

Design a function using my_strcpy and using my_strchr we need to select given char in given string

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Note: If you encounter any issues or specific errors when running this program, please let me know and I'll be happy to help debug them!