TMS320F28335: String Concatenate in code composer using 28335

Tool/software:

Hi ,

      I am using TMS320F28335

I am trying to use string concat , strcpy  , strcmp function for example  testData[10] = {'\x02', 'A', 'B', 'C','2', 'D','0','M','\x03'};

to concat this testData to a string using concat and strcpy as shown below in code.

unsigned char extracted_data[5];
unsigned char Concatenat_Data[]={"\0"};
unsigned int receivedData[10] = {'\x02', 'F', 'R', 'M','2', 'D','0','M','\x03'};
unsigned int process_buffer()
{
    unsigned int i,j, initial_index=0,last_index,c=0;

    unsigned int is_cmd_ready = 0;
    char String_Rxd[10] = {"\0"};
    unsigned int buffer_size = sizeof(receivedData) / sizeof(receivedData[0]);

            for (j = 1; j < buffer_size && receivedData[j] != '\x03'; j++)
            {
               if(receivedData[initial_index] == '\x02' && receivedData[8] == '\x03')
               {

                received_command[j - 1] = receivedData[j];
                Concatenat_Data[c] = received_command[j - 1];
                printf("Concatenat_Data: %c\n", Concatenat_Data[c]);

                printf("Received data: %c\n", received_command[j - 1]);  
                c++;
               }
               else if(receivedData[0] != '\x02' || receivedData[8] != '\x03')
               {

               }
            }

      /*Concat function*/
            concatenateStrings(String_Rxd, Concatenat_Data);
            printf("String_Rxd: %s\n", String_Rxd);
              /*Copy string function*/
            strcpy(extracted_data, Concatenat_Data);
            printf("extracted_data: %s\n", extracted_data);

            c=0;
			is_cmd_ready = 1;

        return is_cmd_ready;
}
void concatenateStrings(char* str1, const char* str2)
{

    while (*str1) {
        ++str1;
    }
    while (*str2) {
        *str1++ = *str2++;
    }

    // Add the null-terminating character
    *str1 = '\0';
}

i) First time when I run the code  getting the concatenate string correctly, by using printf we are making sure data is properly concatenated.

Result :
String_Rxd: FRM

extracted_data:FRM

ii)But when we try to  add additional function/code modification , we are not getting the Concatenated string string as previous result. 

Result :

String_Rxd:
extracted_data: 

1) Need clarification on this as we are trying to add additional function/code , we are not getting the string .

Any Changes in the configuration we should do for String or Any Memory size should we add ? in code composer 

2) When we add more function in this sometimes we are getting result as this , some extra symbols are getting displayed
extracted_data: [empty ] or extracted_data: NP€Ëc÷ð`XÈî99x˜w:wW²

3) Does Code composer support strlen function 

Thanks and  Regards,

Taruna G