1 请编写一个函数fun，它的功能是：比较两个字符串的长度，(不得调用c语言提供的求字符串长度的函数)，函数返回较长的字符串。若两个字符串长度相同，则返回第一个字符串。-1 Write a function fun, its functions are: to compare two string length, (not available in the language requirements call c function of the length of the string), the function returns a long string. If the two strings the same length, it returns the first string.