conditional jump or move depends on uninitialized value4 - valgrind

Question

valgrind shows such errors..
7471== 7 errors in context 4 of 6:
==17471== Conditional jump or move depends on uninitialised value(s)
==17471== at 0x36EA6718D0: _IO_file_xsputn##GLIBC_2.2.5 (in /lib64/libc-2.12.so)
==17471== by 0x36EA64818F: vfprintf (in /lib64/libc-2.12.so)
==17471== by 0x36EA64F189: printf (in /lib64/libc-2.12.so)
==17471== by 0x4008F3: main (main.c:84)
==17471== Uninitialised value was created by a stack allocation
==17471== at 0x4004E8: ??? (in /user/gur39229/extension/assign1/bin/exe)
==17471==
==17471==
==17471== 8 errors in context 5 of 6:
==17471== Conditional jump or move depends on uninitialised value(s)
==17471== at 0x36EA647E2C: vfprintf (in /lib64/libc-2.12.so)
==17471== by 0x36EA64F189: printf (in /lib64/libc-2.12.so)
==17471== by 0x4008F3: main (main.c:84)
==17471== Uninitialised value was created by a stack allocation
==17471== at 0x4004E8: ??? (in /user/gur39229/extension/assign1/bin/exe)
==17471==
==17471==
==17471== 8 errors in context 6 of 6:
==17471== Conditional jump or move depends on uninitialised value(s)
==17471== at 0x4A07FB7: strcpy (mc_replace_strmem.c:442)
==17471== by 0x4008CC: main (main.c:83)
==17471== Uninitialised value was created by a stack allocation
==17471== at 0x4004E8: ??? (in /user/gur39229/extension/assign1/bin/exe)
my code : pls check the code all the initializations and the use of the variables after initiation. at line no. 83 it says uninitialized..y ? i dont understand .. pls help.
/*Declaration*/
42 int i = 0;
43 int a[4]={0};
44 char cstr[80];
45 memset(cstr,0,80);
46 int largest = 0;
if(largest == 3)
82 {
83 strcpy(cstr,str_concat(v[1],v[2]));
84 printf("\t%s%s\n\n",cstr,v[3]);
85
86 }
though i have initialised every variable still its showing valgrind error what to do ?