Introduction - If you have any usage issues, please Google them yourself
Please write the function fun,, function is the function: string array will be placed in the M-string (the length of each string of not more than N), merged in order to form a new string. Function fun statement given for reference only. For example, the string array of M string AAAA BBBBBBB CC is the combined contents of the string should be: AAAABBBBBBCC. Tip: strcat (a, b) function is a character string b string copied to the tail, a new string. Note: some of the source file exists in the file PROG1.C. The data in the data file IN.DAT not modify. Do not