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how to assign the ram continuous without gap?

I define a struct array
struct smp
{ unsigned char attri;
unsigned char data;
} smp[50];
but I find the compiler make a gap between the array. In fact the ram is assigned as
smp[0].attri
smp[0].data
gap[0]
gap[1]
smp[1].attri
smp[1].data
gap[0]
gap[1]
...
so the ram of gap can not be used, then half of the ram is wasted. how can I make the ram of gap to be useful? Can the ram be assign continuous as define a struct array? Can the ram be complied as
smp[0].attri
smp[0].data
smp[1].attri
smp[1].data
smp[2].attri
smp[2].data
...
?

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