c-重用字符指针数组

假设我想"重用"一个字符指针数组，就像下面的程序中那样，循环参数列表中给定的文件，循环文件中的行，将它们添加到动态分配的数组中，然后打印它：

// includes
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
// globals
int progReturn = 0;
int globalLineCounter = 0;

////// main
int main(int argc, char *argv[]) {
    FILE *fp;
    int i;

    // iterate files. first arg is the program name
    for (i = 1; i < argc; i++) {
        fp = fopen(argv[i], "r");
        if (fp == NULL) {
            fprintf(stderr, "The file '%s' did not exist.n", argv[i]); 
            progReturn = 1;
        } else {
            // read lines from the file
            char line[256];
            // THE PROBLEM: I'd like to completely clear this array.            
            char **lines = malloc(16 * sizeof(char*));
            // iterate lines
            int fileLineCounter = 0;
            while (fgets(line, sizeof(line), fp)) {
                // remove newline
                strtok(line, "n"); 
                // add lines to array
                lines[globalLineCounter] = malloc(256 * sizeof(char));
                strcpy(lines[globalLineCounter], line);
                //printf("%sn", lines[globalLineCounter]); // tester
                fileLineCounter++;
                globalLineCounter++;                
            }
            // all lines read
            printf("The file '%s' had %d lines.n", argv[i], fileLineCounter);
            // print the array
            int j=0;
            for (j=0; j<fileLineCounter; j++) {
                // PROBLEM: Garbage from the second file when it prints here. 
                printf("%sn", lines[j]);
            }
            // delete lines, delete file
            memset(lines, 0, sizeof(*lines));
            fclose(fp);
        }  
    }
    // all files read
    return progReturn;
}

在第一个文件中，所有操作都没有问题。在第二个文件中，当我打印数组时，它会显示不可打印的字符，以及第一个文件中的一些行。

是什么原因导致了这个问题？我是否未完全清除**lines？

EDIT：示例输入和输出：

输入文件foo:

This is a test
of the lineSort program
in order to
test its capabilities.
Lots of whitespace too!
aaa
bbb
         cccccc

aaa
ggggg
hhhhh
fffff
eeeee
ddddd
ppppp

输入文件栏：

aaaaaaaaaaaaaaaaa
bbbbbbbbbbbbbbbbb
zzzzzzzzzzzzzzzzz
ccccccccccccccccc
yyyyyyyyyyyyyyyyy

sortLine foo bar:的输出

The file 'foo' had 20 lines.


         cccccc
Lots of whitespace too!
This is a test
aaa
aaa
bbb
ddddd
eeeee
fffff
ggggg
hhhhh
in order to
of the lineSort program
ppppp
test its capabilities.
The file 'bar' had 5 lines.
(x▒▒
(x▒▒
Lots of whitespace too!
in order to
test its capabilities.