Getting error of multiple public defination.

I have done a program with keil,getting error while linking. but the same program is running in single file, i think problem with linking only...up to me,i linked the program..i dont know why is not linking...can any body suggest me.

MAIN FILE:-

#include <REGX51.H>
#include "lcd.c"

unsigned int i=0,l=0;
sbit alsen=P2^0;
sbit eyesen=P2^2;
sbit Buz=P0^2;
sbit motor=P0^4;

void timer_init()
{ IE=0x82; TMOD=0x01; TH0=0x4B; TL0=0xFD; TR0=1;

}

void main()
{ unsigned int j;

lcd_init(); timer_init(); Buz=1; motor=1; delay(65000); delay(65000);

while(1) { if(alsen==1) { lcd_cmd(0x80); lcd_str("Alcohol Detected"); lcd_cmd(0xc0); Buz = 0; motor=0; while(1);

} else if(alsen==0) { lcd_cmd(0x80); for(j=0;j<1000;j++); lcd_str("Alcohol Normal "); lcd_cmd(0xc0);

}

if(l==100) { if(i>20) { lcd_cmd(0xc0); for(j=0;j<500;j++); lcd_str("I Blink Normal"); lcd_cmd(0x80);

l=0; i=0; } else { lcd_cmd(0xc0); for(j=0;j<500;j++); lcd_str("I Blink Abnormal"); Buz = 0; motor=0;

lcd_cmd(0x80); l=0; i=0; while(1); }

} if(eyesen==1) { i++;

} }
}

LCD.C:-(lcd.c)

#include<REGX51.h>

sbit rs=P3^5;
sbit rw=P3^6;
sbit en=P3^7;

void delay(unsigned int d)
{ while(d--);
} void lcd_data(unsigned char c)
{ P1=c; rs=1; rw=0; en=1; delay(150); en=0;
} void lcd_cmd(unsigned char c)
{ P1=c; rs=0; rw=0; en=1; delay(150); en=0;
} void lcd_str(unsigned char *s)
{ while(*s) { lcd_data(*s); s++; }
}

void lcd_init()
{ lcd_cmd(0x38); lcd_cmd(0x0c); lcd_cmd(0x01); lcd_cmd(0x80);
}