Executing shell cmd inside makefile

I am building start.c and test.c inside Makefile.

Requirment:
Building of test.c should start, if executable(start) returns 1.
But I am not getting string "Start", from executable start.
So probably Makefile is not executing start.

Makefile:
Code:CC = gcc
CFLAGS = -g
RM = rm -f

TRG=test
ST=start

all: $(TRG) $(ST)
echo "hello"

$(TARGET): $(TRG) $(ST)

$(ST):
$(CC) $(CFLAGS) -o $(ST) $(ST).c
sh `$(./$(ST))`

$(TRG):
$(CC) $(CFLAGS) -o $(TRG) $(TRG).c

clean: $(TRG) $(ST)
$(RM) $(TRG) $(TRG).o
$(RM) $(ST) $(ST).ostart.c:
Code:#include<stdio.h>
int main()
{
printf("\nStart");
return 1;
}Output of make:
Code:gcc -g -o test test.c
gcc -g -o start start.c
sh ``