update ds18b20.c to snprintf

Guo Wenxue

2022-09-22 732d1963ed83abf4e5f1b06ec451a6943421d716

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INST_PATH=/usr/bin
BIN_NAME=ds18b20
 
all: 
    gcc ${BIN_NAME}.c -o ${BIN_NAME}
 
clean: 
    rm -f ${BIN_NAME}
 
install: 
    @cp ${BIN_NAME} ${INST_PATH}